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"The man in custody was a former boxer and Muay Thai champion, claiming to have a record of 20 wins and no losses, and that is significant in this particular investigation," Supt Clarke said.

Mr Newson didn't apply for bail in Wyong Local Court today and it was formally refused.

Supt Clarke said another man from Lithgow, who was known to Mr Newson and Ms McBride, will be arrested later this week and is expected to also be charged with her murder.

Police allege that shortly after her disappearance, Mr Newson and his co-offender used Ms McBride's ATM card at a local restaurant and bought some drinks in the Scone area.

Her remains were found in 2016. (AAP)

After Ms McBride's remains were found last year, police searched three Hunter region properties including a storage shed in Scone, seizing several items, among them firearms, ammunition and prohibited weapons.

Ms McBride's parents, Lorraine Williams and Steve McBride, never gave up on the search for their daughter's killer.

Last year, they appeared before a press conference in Newcastle, emotionally pleading for anyone who had information about her death to come forward.